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Surface chemistry of metal oxide coated lithium manganese nickel oxide thin film cathodes studied by XPS
被引:154
作者:
Baggetto, Loic
[1
]
Dudney, Nancy J.
[1
]
Veith, Gabriel M.
[1
]
机构:
[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
关键词:
Lithium manganese nickel oxide;
Metal oxide coating;
Thin films;
Lithium-ion;
Surface chemistry;
X-ray photoelectron spectroscopy;
ELECTROCHEMICAL PROPERTIES;
LINI0.5MN1.5O4;
SPINEL;
ELECTROLYTE INTERFACE;
ION BATTERIES;
LI;
SPECTROSCOPY;
PERFORMANCE;
SPECTRA;
D O I:
10.1016/j.electacta.2012.11.120
中图分类号:
O646 [电化学、电解、磁化学];
学科分类号:
081704 ;
摘要:
The effect of coating the high voltage spinel cathode LiMn1.5Ni0.5O4 with three metal oxide thin layers is discussed. Instead of the typical powder electrodes with poorly defined surface coatings, thin film electrodes were prepared with well-defined oxide coating thicknesses to investigate the influence of coating on surface reactivity via X-ray photoelectron spectroscopy (XPS). ZnO is found to decompose during the first charge whereas Al2O3 and ZrO2 are stable for more than 100 cycles. ZrO2, however, importantly limits the available Li storage capacity of the electrochemical reaction due to poorer kinetics. Al2O3 offers the best results in term of capacity retention. Upon cycling, the evidence of a signal at 75.4 eV in the Al2p binding energy spectrum indicates the partial fluorination of Al2O3 into, perhaps, Al2O2F2. Moreover, the continuous formation of ethers, esters and LixPOyFz compounds on the surface of the electrodes is found for all coating materials. (c) 2012 Elsevier Ltd. All rights reserved.
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页码:135 / 147
页数:13
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